链篦机-回转窑铁矿氧化球团焙烧过程的火用分析

来源期刊：钢铁2009年第7期

论文作者：张宇 冯俊小 张材 谢知音 果乃涛

文章页码：90 - 95

关键词：链篦机-回转窑-环冷机； 不可逆； 火用分析； 铁矿氧化球团； 系统节能

Key words：grate-kiln-cooler； irreversibility； exergy analysis； iron ore pellet； energy economy

摘    要：为了降低链-回-环系统球团矿焙烧过程的能耗,对某工业装置进行了火用平衡测试和火用分析,得到了火用流图。火用分析表明,传热不可逆火用损和燃烧不可逆火用损是系统火用损的主要部分。建立了气体质流量、床层空隙率、床高、球团直径、烟气中氧含量等运行参数与火用损的关系。结果表明,适当减小气体质流量、床高和球团直径,增大床层空隙率,可以减小火用损。在其它条件不变的情况下,当烟气中二氧化碳浓度为1.0%～9.0%,将空气消耗系数控制在1.6～2.0,可使火用损最小。

Abstract: Exergy balance test and exergy analysis have been conducted to investigate the thermodynamic characteristics of iron ore pellets induration process in a grate-kiln plant in order to economize energy.And a diagram of exergy flows in the plant helps to identify the sources and quantify the exergy losses.Furthermore,the exergy analysis reveals that the irreversibility of heat transfer and combustion is the major source of exergy destruction.And the effects of some important operating parameters,such as flow rates,porosity in pellet bed,height of bed,diameter of pellets,percent oxygen of gases,on the exergy losses have been studied.At last,the result shows that by reasonably decreasing flow rates,height of bed,and diameter of pellets,and increasing porosity in pellet bed,the exergy losses could be reduced,and reveals that by control of parameter of air consumption coefficient ranging 1.6-2.0 in the kiln,the exergy destruction reaches the minimum at percent carbon dioxide ranging 1.0%-9.0%.